Open 10am to 6pm, free car park on site, free bus service from Shenfield railway station. Admission prices: adult £4.50, seniors £3.50, children £2.50.
It's a great day if you have an interest in modelling, not just trains but also things like the scenery and trees etc. Lots of layouts, an outdoor ride that the kids will love, trade stands for things like modeling paints and books etc, not forgetting the tombola and ofcourse refreshments.
I've lost track of how many years i've been going now, but its always well attended and thoroughly enjoyed.