ON AN EXPRESS ENGINE.

It is a somewhat unpromising morning--the river is dark with fog and the

huge arch of the station nearly hidden by mist and steam. A cold, damp

wind makes the passengers hurry into the carriages, and strikes us

sharply as we step on to the foot-plate of the engine, which has just

joined the train. But as we get behind the shelter of the screen, we feel

a generous and slightly unctuous sensation of warmth very comforting to a

chilly man. The brasswork of the engine shines brilliantly, the footboard

has been newly scrubbed, and the driver and stoker stand waiting for the

signal. The needle shows that the steam is just below the pressure at

which it would begin to blow off; the water in the gauge glass is just

where it ought to be; in fact, the engine is in perfect condition and

ready for a start. The line is clear, the guard's whistle is answered by

our own, and we glide almost imperceptibly past the last few yards of the

platform. The driver opens the regulator till he is answered by a few

sounding puffs from the funnel, and then stands on the lookout for

signals so numerous that one wonders how he can tell which of the many

waving arms is raised or lowered for his guidance.

So he goes on, with hand on regulator and lever, gradually admitting more

steam as signal after signal comes nearer and then flies past us, till at

last we are clear of the suburbs and find ourselves on a gentle incline

and a straight road, with the open fields on either side. It is now that

the real business of the journey begins. Locomotives are as sensitive and

have as many peculiarities as horses, and have to be as carefully studied

if you would ride them fast and far. The lever is put into the most

suitable notch for working the steam expansively; the driver's hand is on

the regulator, not to be removed for the rest of the trip; the furnace

door is thrown wide open, and firing begins in earnest. Here it may not

be amiss to state, for the benefit of the uninitiated, that the regulator

controls the supply of steam from the boiler, while the lever enables the

driver to reverse the engine, or, as we have already stated, to expand

the steam by cutting it off before the end of the stroke. The engine

answers to the appeal like a living thing, and seems, with its steady

beat and sonorous blast, to settle down to its work. It is pleasant from

our seat in the corner of the screen to see this preparation for the work

ahead--the absolute calm of driver and stoker, who exchange no word, but

go steadfastly and quietly about their business; to feel the vibrations

from the rails beneath throb through one with slowly increasing rapidity,

or watch the trees and houses go past as gulls flap past a boat. For

there is a certain apparent swagging movement of the objects past which

one travels which can only be likened to the peculiar flight of a large

sea-bird. But now there are signs of increased activity on the

foot-plate; the stoker is busy controlling the feed of water to the

boiler, and fires at more frequent intervals; the driver's hand moves

oftener as he coaxes and encourages the engine along the road, his

slightest gesture betraying the utmost tension of eye and ear; the

stations, instead of echoing a long sullen roar as we go through them,

flash past us with a sudden rattle, and the engine surges down the line,

the train following with hot haste in its wake. We are in a cutting, and

the noise is deafening. Looking ahead, we see an apparently impenetrable

wall before us. Suddenly the whistle is opened, and we are in one of the

longest tunnels in England. The effect produced is the opposite of that

with which we are familiar in a railway carriage, for the change is one

from darkness to light rather than from light to darkness. The front of

the fire-box, foot-plate, and the tender, which had been rather hazily

perceived in the whirl of surrounding objects, now strike sharply on the

eye, lit up by the blaze from the fire, while overhead we see a glorious

canopy of ruddy-glowing steam. The speed is great, and the flames in the

fire-box boil up and form eddies like water at the doors of an opening

lock. Far ahead we see a white speck, which increases in size till the

fierce light from the fire pales, and we are once more in open day. The

weather has lifted, the sky is gray, but there is no longer any

appearance of mist. The hills on the horizon stand out sharply, and seem

to keep pace with us as the miles slip past. The line is clear; but there

is an important junction not far distant, and we slacken speed, to insure

a prompt pull-up should we find an adverse signal. The junction signals

are soon sighted; neither caution nor danger is indicated, and, once

clear of the station, we steam ahead as fast as ever. One peculiarity of

the view of the line ahead strikes us. Looking at a railroad line from a

field or neighboring highway, even where the rails are laid on a steep

incline, the rise and fall of the road is not very strikingly apparent.

Seen through the weather-glass, the track appears to be laid up hill and

down dale, like a path on the downs above high cliffs. Over it all we

advance, the engine laboring and puffing on one or two heavy gradients,

in spite of a full supply of steam, or tearing down the inclines with

hardly any, or none at all and the brake on. And here it may be noted

that, like modern men, modern engines have been put upon diet, and are

not allowed to indulge in so much victual as their forefathers. The

engine-driver, like the doctor of the new school, is determined not to

ruin his patient by over-indulgence, and will tell you severely enough

that "he will never be guilty of choking his engine with an over-supply

of steam." In the mean time, the character of the country we travel

through has changed. It has become more open, and there is a stiff

sea-breeze, which makes itself distinctly felt through the rush of air

produced by the speed at which we are going. We fly past idle streams and

ponds, and as the steam swirls over them are disappointed at producing

so little effect; but the ducks, their inhabitants, are well used to such

visitations, and hardly deign to move a feather. Suddenly we plunge into

a series of small chalk cuttings, and on emerging from them find

ourselves parallel with a grand line of downs. We speed by a curve or

two, and find ourselves on the sea-shore; one more tunnel, and with steam

off we go soberly into the last station. But there is one step more. The

breeze blows about our ears. Before us the rails are wet, for the sea

swept over them not many hours since, and to accomplish the last few

yards of our journey the lever controlling the sand-box must be used

liberally, to prevent slipping; the signal is given, and at a walking

pace we make our way to where the steamer is awaiting us. A gentle

application of the brake pulls us up, and the journey is over. It is

difficult to realize, as the engine stands quietly under the lee of the

pier while the driver examines the machinery, and the fire, burned low,

throws out a gentle warmth as we stand before it, that half an hour ago

we were tearing along the line at full speed, while the foot-plate that

is now so pleasant to lounge on throbbed beneath us. Nothing now remains

but to kill time as best we may till the return trip many hours hence. It

scarcely promises to be as comfortable as our morning ride, for the

weather has changed--it is blowing half a gale, and the rain comes down

in sheets. Our train is timed to start in the small hours, and the night

seems dirty and depressing enough as we make our way for a cup of coffee

to the refreshment room, where a melancholy Italian sits in sad state

eating Bath buns and drinking brandy. We walk past the train, laden with

miserable sea-sick humanity, and step on the engine, which stands in the

dark at the end of the platform. Time is up, and we pass from the dim

half-light of the station into outer darkness. A blacker night there

could hardly be; looking ahead there is nothing to be seen but one's own

reflection in the weather-glass. We are in the midst of obscurity, which

suddenly changes to a rich light as the whistle is opened and we enter a

tunnel. The effect is far more striking than in the daytime. The light is

more concentrated, and the mouth of the tunnel we have just entered might

be the entrance to Hades--for there is no telltale spot of light to prove

to our senses the existence of any opening at the other end. The sound

echoed from the walls and roof has a tremendous quality, and resolves

itself into a grand sort of Wagnerian rhythm, making a vast crescendo,

till with a rush we clear the tunnel, and are once more under the open

sky. The pace is increasing, the steady beat of the engine tells more

distinctly on the ear than in the daytime; the foot-plate is lit up by

the glare from the fire-door; but still there is nothing to be seen ahead

but the impenetrable night. Looking back, however, the scene is very

different. The tender and guard's van glow in the light thrown by the

fire, trees and houses by the side of the track stand out sharply for a

moment and are then lost to sight, the light from the carriage windows

produces the effect of the wake of a ship seen from the stern. Gradually

the clouds have rolled away, leaving the sky clear. The moon is seen

fitfully through the whirling steam; the surrounding country is visible

for miles round. The effect produced is unspeakably beautiful. In the

mean time let us turn our attention to the working of the engine. In the

first place, let us take note that, although the engine we are now on,

and that which took us from London, belong to the same type, their

performances are somewhat different. No two engines ever resemble each

other, no matter how carefully they may have been built from the same

plan, neither do any two drivers manage their engines precisely in the

same way. We have in this instance an excellent opportunity of comparing

two different methods of driving. It is the driver's principal object to

get the required amount of work out of his engine with the smallest

possible expenditure of coal and water. To obtain this result the steam

must be worked expansively, which is done by placing the valve gear in

such a position by means of the lever that the supply of steam to the

cylinders is cut off, as we have stated at the beginning of this article,

before the piston has accomplished its full stroke. There are two ways of

controlling the speed of an engine worked, as all locomotives are worked

now, expansively. You may keep the regulator wide open, so that there is

always a full supply of steam on its way to the cylinders, in which case

you increase or diminish the speed by using the steam more or less

expansively through the agency of the lever. Or you may work with the

same amount of expansion throughout the journey, and have command of the

engine by constantly changing the position of the regulator. There is no

doubt that the men who employ the latter method save something by it,

although this would hardly seem to be the opinion of the driver who is

bringing us rapidly nearer to London, for unlike the driver whom we

accompanied on the daylight journey, his hand is not often on the

regulator. As we rush on past countless signals, punctual to the minute,

yet always having ample time to slacken speed before we come to the

places where the different colored lights cluster thickest, we are

reminded once more how much is required of an express engine-man besides

a thorough acquaintance with the machinery he has to control. Traveling

at night at a great speed, he must know every inch of the road by

heart--where an incline begins and where it ends, and the exact spot at

which every signal along the line may be first sighted. He must have

completely mastered the working of the traffic on both the up and down

lines, and, above all, must be ready to act with the utmost promptitude

should anything go wrong. Mr. Michael Reynolds' publications have done

much toward enlightening the public on these points, but we doubt if

there are many who really know the amount of toil and danger cheerfully

faced by the men on the engine, who hold their lives in their hands day

after day for many years. These thoughts occur to us as we recross the

Thames and pull up at the platform after a thoroughly enjoyable

run.--_Saturday Review_.

* * * * *

The mucilage on postage stamps may not be unhealthy, but persons having a

good many to affix to letter envelopes, circulars, newspapers, or other

wrappers every day, will consume considerable gum during a year. A less

objectionable mode of affixing stamps than the one usually employed is to

wet the upper right hand corner of the envelope, and press the stamp upon

it. It will be found to adhere quite as well as if the stamp went through

the moistening process.

* * * * *

Scientific American Supplement, No. 492, June 6, 1885 · 第 51 / 59 题