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plural only
Alternative letter-case form of TPH (“trains per hour”) quotations examples
Transport for London is working to increase capacity on the East London line stretch of London Overground. Work is underway to increase frequencies from the current 16 trains per hour (tph) to 18tph, with new funding now announced to further improve this to 20tph in the future.
2019 September 5, “Funding for 20tph East London line service”, in Modern Railways