shunter

noun3

1. •
   (UK) A railway locomotive used for shunting (switching).

   • Concurrent to this order, Good forged a link with Irish Railways, which resulted in the latter building five shunters with Brush equipment, marking the inception of dieselisation in the country. — 2021
2. •
   (UK) A person who carries out shunting operations.

   • The electric locomotive is accompanied by a shunter who, in addition to his normal duties, flags the trains over the unprotected level crossings and opens the gates through which the line passes. — 1957
3. •
   (UK, historical) One who shunts (carries on arbitrage between London and provincial stock exchanges).