Model JMY270D diesel locomotive is a shunting type of hydraulic traction equipment having a small-medium power.It has a narrow width, easy operation and maintenance and low cost of operation and maintenance,especially Caterpillar engine and hydraulic torque converter are provided for engine exhaust emission index and noise level to comply with international standard. The locomtives are applicable for traction equipment in large medium-size metallurgical or chemical enterprises,especially in the construction of metros or tunnels and other underground mines whrer there is a great demand of transport.