The JT 42BW is a class of four axle Bo'Bo' diesel electric locomotives manufactured by Alstom's (previously by Vossloh and now by Stadler.

[4]) Meinfesa plant in Spain for Israel Railways (IR).

The locomotives are of the Prima type, produced at Alstom's plant in Valencia, Spain in collaboration with GM-EMD; the locomotives use EMD traction equipment and an EMD 710 engine.

[9] Two units, numbers 739 and 741 were rebuilt after being involved in accidents at Ahuzam and Beit Yehoshua.

[10] In 2011 IR ordered 24 four axle Bo'Bo' Euro 3000 AC locomotives from Alstom Valencia successor company Vossloh España;[11] these locomotives inherit some design features from the JT 42BW, including the use of an EMD 710 engine, though unlike the JT 42BW the locomotives use AC motors controlled by IGBT electronics.