Do you mean LOM (Local Operations Manager) or MOM (Mobile Operations Manager)?
Usually LOMs get a car or at least access to a pool car. It’s an office based management role so most wear smart business clothes, a suit or the smart version of the uniform. Ties have been optional at Network Rail since Iain Coucher was CEO (he didn’t like them).
MOMs will have a small or medium van, or a 4x4. Dress is anything from ripped jeans and a band t-shirt to three piece suit depending on the individual and the occasion!