The function would flag the consist as not ready (`iEngineActive` set to `false`) when the brake handle was at a cutoff position. Since this is what the brake lever is exactly starting at in the EW58 train, the train when asked to move the brake lever to operating position would not listen since the `control_tractive_and_braking_force()` function which is supposed to do that is gated behind the readiness flag in the `TController::Update()` function.
This makes sure EW58 trains can be driven by AI once again instead of being stuck.
I don't really know why the brake position check was there, since it would fail only if:
- There is a brake handle
- The brake handle is in the cutoff position
- The brake handle is NOT in the operating position
The third check seems redundant but curiously there is one case where this matters and it's... MHZ_EN57. Its operating and cutoff positions are both defined as `0`, which might be a hack, since the actual cutoff position in the MHZ_EN57 handle is meant to be `6`.
CabActivisation() passed DirAbsolute (DirActive * CabActive) as the value of the
"Direction" command, which every receiving vehicle stores as its own DirActive.
Every other sender passes DirActive. With the cab at the rear end (CabActive = -1)
the two have opposite signs, so the other units got their reverser flipped
against the controlling one.
It shows whenever a rear cab is activated after the reverser has been set:
- the AI takes over an occupied cab (TakeControl() calls CabActivisation(true)),
e.g. an EN57 inserted with reardriver and a starting velocity: the motor car
drives the train backwards;
- a vehicle without automatic cab activation (SA134) driven by the AI from the
start: the cab is activated by a driver hint after the reverser is set, and
the two units pull against each other.
Fixes#169.
