Railways Pension Trustee Company chief executive Phil Willcock has quit the scheme after only 10 months to take up a position as head of AIG UK Life.
The Railways Pension Trustee Company - which runs the railway pension schemes through its subsidiaries RPMI and RPMI Railpen - said the process of appointing a new chief executive would now begin, supported by RPMI chairman Babloo Ramamurthy.
Willcock had begun work at RPMI at the begining of this year - joining from Aviva, where he had been, most recently, chief executive of Aviva Italy.
Commentating on Willcock's departure, Ramamurthy said: "We will be seeking to recruit a high calibre successor who will help deliver RPMI's mission of paying members' pensions securely, affordably and sustainably and provide support to the trustee of the Railways Pension Scheme."
Former LGPS Central chief executive Andrew Warwick-Thompson has joined Capital Cranfield as a professional trustee.
Former pensions minister Stephen Timms has been elected chairman of the influential Work and Pensions Committee (WPC).
Caroline Siarkiewicz has been appointed as chief executive of the Money and Pensions Service (Maps) after seven months in the position on a temporary basis.
Nest has announced it has reached £10bn of assets under management (AuM) and has also appointed two external additions to its investment committee.