It's known affectionately as the Thumper, and it's coming to Gloucestershire 6 July 2019.
 
This iconic 1950s diesel engine is chugging through the county with about 260 passengers on board and you've got two opportunities to see it.
 
It's coming all the way from Hastings to Gloucester, and from there onto Dean Forest Railway for a short trip, then back again.
 
At Gloucester Railway Station and Lydney Junction, it will stop, the longest time it will spend stationary is at Lydney Junction on the Dean Forest Railway from 16:52 until departure at 17:30.
 
It's only the third outing for the Thumper this year, which is privately owned by Hastings Diesels.
 
Their website says of the trip, "Our third outing of 2019 is to Gloucester and onto the preserved Dean Forest Railway. This 403 mile rail tour starts at Hastings and serves the usual stations to Tonbridge, Redhill, and Guildfordand Reading. We'll be routed via Swindon and the Golden Valley line through Kemble to call at Gloucester, before the final 19 miles travel to Lydney on the northern shore of the Severn Estuary. On approach to Lydney we will traverse the connection onto the Dean Forest Railway, before serving Lydney Junction station on the preserved line. We'll run in service to Norchard for water-tank reflling, and will later proceed to Parkend at the far end of the line. The return leg of the trip begins with a non-stop run from Parkend to Lydney Junction. Club Class passengers are seated at tables, and the fare covers refreshments including a meal with wine on the return leg of the trip. Club Class isn't available from Reading as there is insufficient time from Gloucester for the evening meal."
 
Of the train itself, they say, "Our train is a Diesel-Electric Multiple Unit (DMU) that worked on the London Charing Cross-Hastings route under British Rail between 1957 and 1986.
 
"It was subsequently preserved by Hastings Diesels Limited, we restored it to its former glory and returned it to mainline operation ten years later, in 1996. Our train is commonly referred to as Unit 1001, as the first Hastings DMU (all six of whose vehicles we own) was so numbered. Although the train we use on our outings does include at least one vehicle from the original unit 1001, some of its vehicles are from other units, and indeed, other trains."
 
Tom Gibbon.