DM3 Married Unit/ slug

[frozen stratus]

Either a slug Specificly for the DM3 or a Mother-Daughter unit like the Class 13. You could remove the cab for visability.

[sand holly]

FYI the class 13 is diesel electric

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I know but its called an example.

[meager pebble]

how would the MU work

ig it would kinda be like mechanical push-pull equipment

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It could be perma coupled

[signal axle]

is that your model? not bad.

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Just an example I found

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Electrical to mechanical servos

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Everything would be hidden on the Slug anyway

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@fathom elbow

[unkempt cave]

source?

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Bachman

[plain frost]

pneumatic :<<<

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Hydrolic even

[plain frost]

yuh so u need to flush or fill the lines every time u connect/disconnect it

also u can make it like those flexible brake and shift cables that bikes have

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Quick Disconects loose almost zero fluid plus it could have a reservoir like a clutch or brake

[plain frost]

thatll make more sense

[plain frost]

havent heard of them :<<<

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also its a game so it can kinda be yada yadaed away

[plain frost]

Ooo

look interesting

were they a thing in 1950s tho?

[plain frost]

hmmm

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The main train could have a hydraulic pump run off the engine with fluid pressure running to the 3 position valves connected to a 3 position cylinder

with Tees for the slug

[plain frost]

makes sense ig

[prisma halo]

Manufacturers of hydraulic equipment likely had these widely adopted by the 1950s.
Nowadays, rubber hoses for hydraulic equipment that need to be connected and disconnected frequently (such as test pump units) almost always have Quick Disconnects (hydraulic hose quick couplers).

[plain frost]

nice

[unkempt cave]

I have a better idea

Make the slug a B-Unit

Give it its own prime mover

[plain frost]

it will have its own prime mover

cuz it is in fact a b-unit

[unkempt cave]

The why do we need to bother with Pneumatics or Hydraulics

We can simply control it through electronics

[plain frost]

whats the point of an electronically controlled DM3?

[meager pebble]

that's not very mechanical

[unkempt cave]

Well then, how do you control a B unit?

[meager pebble]

adapted mechanical push-pull equipment

like the stuff the GWR used (or similar) but used to transmit controls across locos instead of a control car to a loco

[unkempt cave]

hmmm

What about a Pushrod

To control traction

Brakes are controlled pneumatically anyway

Pushrods make sense imo

[plain frost]

pretty much

but articulation is a thing

[unkempt cave]

Kid named Universal Joints

[prisma halo]

The key factor in control and signal transmission is system accuracy.
In a mechanical signal transmission system, the longer the distance and the more components such as linkages and gears there are, the greater the cumulative error becomes and feedback becomes difficult. It also increases the risk of failure.
This is why mechanical remote control system is not mainstream even today.

Until around the 1960s, pneumatics was an extremely good solution, offering a high degree of design freedom, making it easy to transmit pilot pressure evenly and accurately over long distances (although this required some time to elapse), and providing a highly safe system.

It wasn't until a little later that wired electrical/electronic remote controls really took off.

[unkempt cave]

What about hydraulic then

[prisma halo]

Hydraulics are an excellent means of transmitting signals.
However, like air, leakage becomes a problem. Any leaked fluid must be refilled. Compared to the air that can be continuously supplied from the compressor, it inevitably increases the labor required by the workers.
With today's technology, it is relatively easy to prevent leaks, but with the technology available in the 1950s, it may have been difficult for seals and fittings to withstand severe vibrations and environmental changes.

As you may already understand, there are already very convenient signal transmission methods such as air and electricity in railway vehicles, so there is almost no benefit to adding hydraulics as a new transmission method.

However, if engineers with absolute confidence in hydraulics had developed technology to apply hydraulics to train control signal transmission and braking, there might have been a world in which hydraulics replaced pneumatics.