SU9974 : Train ferry or ready for the High Speed Floaterway?

Houseboats are common along the River Thames, so if you have an old barge about 75 feet long and 12 feet wide and a disused railway carriage about 60 feet long and 9 feet wide, why not combine them? Maybe not as palatial as the castle a mile or so up the river but the riverside here at Old Windsor is probably quieter.