Health Secretary Jeremy Hunt said he was clear the clinical case for changes to how children's heart surgery units are run remains, despite today's suspension of plans to close three units.
Speaking to the House of Commons, Mr Hunt said the independent review he instigated, following complaints from units where closure was recommended, still stressed the "case for change."
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Transport Secretary Chris Grayling believes Network Rail should share the responsibility with private train operating companies.
Two vehicles were swallowed up by the sinkhole on Sunday night, killing Dora Linda Nishihara and injuring one man.
Elliott Livingstone, aged three, spent most of his life in hospital before the operation in April.