British Conservative Party leader David Cameron has complained to operators of a train after his attempts to find an open bathroom were frustrated.

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Riding a Virgin Train from Euston, London, to Wolverhampton, Cameron found the first restroom he attempted to use was out of order and the only other restroom in the first-class section -- designed for handicapped users -- had a long line, The Daily Mail reported Monday.

Virgin Trains promised to conduct an investigation but officials said the train did have a third bathroom in the standard class section.

"The lavatories in first class were working -- but there may have been long queues because the train was very busy," a Virgin Train spokesman said.