Initial construction saw 48 ACP cars, 62 AP, 18 BCP and 62 BP carriages built in the period 1910 to 1913. The AP and BP carriages were of identical design with capacity for 92 passengers each across nine compartments, except that the second class BP carriages had lower-quality seating. Similarly, the ACP and BCP cars shared a design in every way other than the seating; these carriages were fitted with eight compartments for 82 passengers, and the ninth compartment was repurposed for a train guard. This last compartment was fitted with a raised cupola for sighting of signals.