I know part of your question, Marches is an English word used for describing the land each side of the boarder between Wales and England. It is not precise as the area over the centuries has changed. The tour to Hereford will be travelling through the part of the Welsh Marches. Regarding '60'you have me there I have put a request into the tour operator to find out why.
Here's the answer from the organizers Not sure where you may have heard its name (though I've since referred to it on the website). It was a private charter of our train by one of our shareholders for his 60th birthday. 'Marches' was a pun because not only was the train going to the Welsh Marches, but his birthday would mean he'd encountered 60 Marches in his lifetime.
Regarding '60'you have me there I have put a request into the tour operator to find out why.
Not sure where you may have heard its name (though I've since referred to
it on the website). It was a private charter of our train by one of our
shareholders for his 60th birthday. 'Marches' was a pun because not only
was the train going to the Welsh Marches, but his birthday would mean
he'd encountered 60 Marches in his lifetime.