Green’s Dictionary of Slang

go-away n.

1. (Aus./US Und.) a railroad train; a tram, a bus.

[US]Matsell Vocabulum 38: The knuck was working the goaways at Jersey City, and had but touched a bloke’s leather, as the bull bellowed for the last time, and so the cove mizzled through the jigger [etc.].
[US]Trumble Sl. Dict. (1890).
[Aus]Crowe Aus. Sl. Dict. 32: Goaways, trains and tram cars.
[Aus]Baker Popular Dict. Aus. Sl.
[Aus]N. Pulliam I Travelled a Lonely Land (1957) 233/2: go-away – a train.

2. (UK society) the dress in which a bride departs from her reception to begin her honeymoon.

[UK] (ref. to 1886) in J. Ware Passing Eng. of the Victorian Era.