D5905 and D5909 were kept especially for engineers trains and stored at Hitchin, after the withdrawal of the rest of the class, as it is reported drivers preferred the draught-free cabs to those of the more abundant Brush Type 2s. That said, it was more likely that the 'official' reason was to temporarily cover Brush type 2's which were absent due to being fitted with air-braking equipment. The pair are seen at Hitchin during the summer of 1970.