The trains on the picturesque narrow-gauge Pelion line from Volos to the mountain village of Milies will be running on additional days during the Easter holidays, in addition to the customary weekend services - specifically on Holy Thursday, 17 April, Good Friday, 18 April, Monday, 21 April, Tuesday, 22 April and Wednesday, 23 April, due to the increased demand. 
Specifically, on the above dates the 3800 train will depart from Ano Lehonia at 10:00 and will return from Milies at 15:00 as train 3801 with a 15-minutes stop at Ano Gatzea in both directions of the route.
More information is available on https://tickets.hellenictrain.gr/, or on https://www.hellenictrain.gr/treno-toy-pilioy-mia-mythiki-diadromi as well as on Hellenic Train's application for mobile phones and on the special telephone number for tourist trains 213 0121010.