 Complete the following phrase:  Three examples were built by Wolverton Works in 1861 with driving wheels together with McConnells patented firebox, which were intended for the fastest expresses. They were heavier than had been planned, so a further two engines, ordered and under construction, were cancelled in February 1862. This led to McConnells immediate resignation. The three completed engines Nos. 37235 went into store, so hardly ran in their original state. One of them No. 373 was put on show at the 