If you get on a heritage train then these have windows that can be opened and a gps trace is no problem.
Last weekend I surveyed the track from Wollongong through to Moss Vale. (riding behind the relaunched steam locomotive - 3265) In sydney you can get a signal on the Tangara trains but I couldn't get a signal on the Millennium train. I also couldn't get a signal on the explorer train but I don't know about the XPT. It would certainly help to get a lock prior to boarding. On the Tangara, I noticed that there was a relatively large stripe of "small black dots" at the top of the window. I think that these may be what allows the RF signal to enter. (Thats like the area on some windscreens where the RTA says to place the e-tag). On the Millennium sets, this stripe was very small. The C-set trains allowed a gps signal quite well.
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