Hobo

Someone who purports to be homeless and without financial means.  They can be seen riding the rails in the USA where this has become a life long career for some.

Hobos were riding trains during the great depression in Australia.  (1930's)

Lash up

Usually a combination of 2 or more locomotives usually on the head of a freight train (especially applies when there's more than 3). Most commonly used when something unusual or pleasing to the gunzel is running the train.

Example: Got a kickarse lashup on 9121 yesterday - XR553, G533, T399, T408 and X31 all powering through Meredith.

Local

A train service that originates from/terminates at an intermediate location on a railway line.

Example: The Blackburn locals are usually quite empty.

Road Train

Road trains actually have at least 38 wheels (10 on truck itself, 4 on C trailer, 4 on B trailer and 6 on A trailer) . . . The Australian term for '18 wheeler' is semi or semi-trailer, as Australian trucks with just the truck and one trailer have 22 wheels (triple axles on the trailer).

Spark

Suburban EMU service. See EMU.

Example: I'm sick of photographing sparks - let's go out into the country.

Stick

Colloquial term for signal.