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NZR RM class Standard
RM 31 (Tokomaru) at the Pahiatua Railcar Society.
Power type	Diesel Mechanical railcar (Passenger capacity: 48 - 52)
Builder	NZGR Hutt Workshops (6)
Build date	1938
UIC classification	A1 - 1A
Gauge	3' 6", 1067mm
Length	20.7m
Total weight	107 t
Prime mover	2x Meadows 6 cylinder
Top speed	105km/h
Power output	2x 85 kW, 115 hp
Career	New Zealand Railways
Number in class	6
Number	30 - 35
Locale	Lower North Island
First run	1938 - 1939
Disposition	Withdrawn, four preserved

The NZR RM class Standard railcars were a class of railcar operated by the New Zealand Railways Department in the North Island of New Zealand. Officially classified as RM like all other railcar classes in New Zealand, they acquired the designation of 'Standard' to differentiate them from others. They were introduced in 1938.

Since the 1912 experiments with a MacEwan-Pratt petrol railcar, the New Zealand Railways Department had been seeking an effective and successful railcar design. Many routes simply did not have the demand to economically justify locomotive-hauled passenger express trains, so railcars were seen as a viable alternative. New Zealand's difficult terrain posed problems to railcar design, but in 1936, the Wairarapa railcars were introduced and proved to be a great success on the route from Wellington over the famous Rimutaka Incline to the Wairarapa Line, and following from this, the Standard railcars were designed to provide regional services in on regular lines in the North Island. Six total were built in the NZR Hutt Workshops in 1938 and 1939, each with a semi-streamlined design featuring slanting ends. Driving controls were located at each end of the railcar so that they did not have to be turned at termini.

All six of the Standard railcars were named after famous Māori canoes:

• RM 30: Aotea
• RM 31: Tokomaru
• RM 32: Pangatoru
• RM 33: Tākitimu
• RM 34: Tainui
• RM 35: Tikitere

RM 31 (Tokomaru) going for a run through the Pahiatua station yard.

The Standard railcars were first used to operate a fast return service from Wellington to New Plymouth, and soon a Hawkes Bay service between Wairoa and Napier was added, along with a Sundays-only return service from Napier to Wellington. In 1943, the Wairoa-Napier service was extended to serve Gisborne.

In 1955, the 88 seater railcars were introduced, and 88 seaters and Standards initially shared duties on the New Plymouth and Hawkes Bay services, but soon the 88 seaters took over all of the Hawkes Bay services and the Standard railcars were left to run the New Plymouth route. After the opening of the Rimutaka Tunnel in November 1955, both the 88 seater and Standard railcars soon took over from the Wairarapa railcars and operated a service from Wellington to Palmerston North via the Wairarapa.

The Standard railcars never operated in the South Island, as the Vulcan railcars were built to operate rural services on that island.

In September 1938 RM 30 covered the 321 km between Napier and Wellington in 4 hours and 36 minutes running time. In 1967 RM 30 took a group of railway enthusiasts from Auckland to Wellington in 9 hours and 26 minutes (running time 8 hours and 42 minutes).

RM 31 (Tokomaru) at Pahiatua.

The Standard railcars were withdrawn in 1972, and two-thirds of the class have been preserved. Two, RM31 and RM34 are in the possession of the Silver Stream Railway, one, RM31 is owned by the Pahiatua Railcar Society and RM32 is owned by the Waikato Branch of the NZRLS and is currently at the Glenbrook Vintage Railway undergoing restoration work.

• Rail: The Great New Zealand Adventure by Roy Sinclair (1987, Grantham House Wellington) ISBN 1869340132 (record runs, page 85)

• Pahiatua Railcar Society - RM 31
• NZ Diesel and Electric Traction - Standard railcar