Definition of "nameboard"

On once more we swung, bumping uneasily along in the antique narrow-gauge coach, with gloomy woods and gathering night outside, shouts and songs (and quacks) inside—this was not at all the sort of train ordained by the logical strategists in Paris—then grinding to a stop at a mysterious halt which was no more than a nameboard in the pinewoods, without even a footpath leading to it, but nevertheless with a solitary passenger stolidly waiting.

1961 November, H. G. Ellison, P. G. Barlow, “Journey through France: Part One”, in Trains Illustrated, page 668

Finally the couplings whimpered and the train limped off at a slow haul to another country station whose flaky nameboard read 'Adlestrop'.

2004, David Mitchell, Cloud Atlas, London: Hodder and Stoughton, page 171