Possible Clues:

• School again using check when subject's brought back in
• Keep confining ring-leader to school again
• King imprisoned in keep gets to prepare for a new job
• Coach further, and keep, outside right
• Give fresh refresher courses to
• Gain new skills concerning the Orient Express, say
• Learn a new job skill, getting put up in control
• Transport engineers first to prepare for new job?
• Teach new skills to
• Instruct for a new job, say