Possible Clues:

• What those on boards do hidden from view?
• Tries once more, by end of stage, to practise
• Run through Rome's outskirts with slow vehicle
• Once more try getting on Home Counties train
• Again tries, with energy, to perform play in practice
• Tries again with European play, in practice
• Train? Leaders of railway expand late transport
• Go over tries again by English
• Practise with special vehicle about to start
• Researcher, not Roman Catholic, arranged run through