Analysis of information sources in references of the Wikipedia article "British Rail Class 157" in English language version.
Hunslet TPL (Engineering and Project Management) becomes Holec Ridderkerk (Birmingham) Limited, latterly Holec Ridderkerk UK Limited: 15 March 1994
Hunslet TPL (Engineering and Project Management) becomes Holec Ridderkerk (Birmingham) Limited, latterly Holec Ridderkerk UK Limited: 15 March 1994
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