The locomotives were chosen on grounds of weight and reliability, and had a top speed on the level of only 8 miles per hour (13 km/h), taking 95–98 minutes to travel the six miles (10 km) between Brill and Quainton Road, an average speed of 4 miles per hour (6.4 km/h).
Yang locomotives dipilih atas dasar berat dan reliability, dan memiliki puncak kecepatan pada tingkat hanya 8 mil per jam (13 km/h), mengambil 95-98 menit untuk perjalanan enam mil (10 km) antara Brill dan Quainton Jalan, rata-rata kecepatan 4 mil per jam (6,4 km/h).