Yes, Hot Water.
PRR. Less Than Carload, Merchandise Service box cars, started in 1946 and are listed below:
Phase I 40' (X29B)
Phase I 50' (X41B)
Phase I 60' (X40B)
Phase II 40' (X29)
Phase III 40' (X29)
All three length box cars, with the Phase I scheme, had the intricate, multi color, fancy paint scheme.
Phases II and III had a plain scheme, having white markings on the brown body of the box cars, which saved costs in paint and artistry.
Ralph