low-speed

low-speed (comparative more low-speed, superlative most low-speed)

1. That operates, moves or takes place at less than normal speed.
   • 1961 February, “Talking of Trains: Collision at Newcastle”, in Trains Illustrated, pages 75–76:

     The difficulties of focussing colour-light signals on curved tracks to ensure maximum sighting distance were underlined in the recent official report [...] on a low-speed collision at Newcastle Central on July 25, 1960, between an unfitted freight and a diesel-hauled passenger train.

• high-speed