"MIG" wrote
I suppose I could stand there till a train leaves from platform 15, but
that might seem obsessive. Somebody working for SWT probably knows.
An easier way is to ask
http://217.23.229.206/jpclient.exe
for trains from Waterloo to Clapham Junction. The next one from platform 15
comes up as the 05.05 to Reading, headcode 1C05.