For some stations,you can find this information on TIGER, a web-based version of the customer information system displays in stations. Here’s London King’s Cross for example, displaying number of coaches for most trains.
It doesn’t seem to cover every station, and even for the ones it does cover, length information isn’t always present, but it’s better than nothing.
As for why this isn’t available on RealTimeTrains: as I understand it, this information isn’t part of any of the publicly available data feeds that RTT uses.
At least for peak services, you can visit http://www.thameslinkrailway.com/your-journey/planning/gn-seats/ which has, for most stations, a table of peak-time trains showing the number of carriages and how crowded they are predicted to be.
Credit:stackoverflow.com‘
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