budd's coaches comfort features included: speakers on the seats, individual lights and tables, carpeted floor, venetian blinds, arm chairs in saloon coaches, pneumatic doors, and reclining chairs. coaches were towed by caprotti steam locomotives, eventually using diesel machines. in 1952 diesel locomotives by local company fábrica argentina de locomotoras (fadel) named "justicialista" made their debut on the line. those machines had been built at liniers workshops. in 1952, the locomotives began to serve on the constitución-mar del plata section to tow the "marplatense" express with a journey time of 3 hours and 45 minutes.