Our new ticketing site is now live! Using either this or the original site (both powered by TrainSplit) helps support the running of the forum with every ticket purchase! Find out more and ask any questions/give us feedback in this thread!
Presumably you mean Acton (LTM) Depot, rather than any of the operational ones...
Nothing announced as yet, but they are broadly late Spring (March/April), early Summer (June/July) and early Autumn (late September). Dates are usually announced around February, so it is a little early yet.
Interested in knowing too, I've not been to the LTM depot open day in about 15 years, I missed them all last year so will have to keep an eye out this year.
Explore the Depot on three open weekends each year. Discover rare road and rail vehicles spanning over 100 years, signs, ceramic tiles, original posters, ephemera, ticket machines, and more.