Reply to "What signals can be operated by Tortoise Switch Machines?"

You can wire one or more pairs of LEDs in series with the Tortoise motor to have directional signals and/or panel lights.  The wiring is very simple and you don't even need to use the relay contacts in the Tortoise.

#3 is the basic Tortoise wiring and #4 shows where to wire the LEDs between the Tortoise and the SPDT Panel Switch. Note that you can have one pair of LEDs on the panel and one pair as ground signals by the turnout.

The small stall current in the motor keeps the LEDs lit.  

Here is the full Tortoise instructions.

Bob