The design was aimed at increasing thermal efficiency by re-using the firebox gases and redirecting them through a second drum beneath the boiler to pre-heat the water feed.
The Crosti 9F's exhaust was expelled from a chimney slotted into the running plate, but this often led to unpleasant conditions for footplatemen with trailing smoke often obscuring the driver's vision.
The introduction of diesel multiple units (dmus) offered a practical solution to this problem as the engines of several railcars could be coupled together to meet varying traffic needs, therefore the power available became proportional to the length of the train.
In this view, a Black 5 heads a lightweight Carlisle-Leeds train alongside an 8-car BRCW (Class 104) on a SO Bradford Forster Square-Scarborough service out of the cutting near Newlay & Horsforth in June 1962.(Above-Below) The Anglo-Scottish 'Waverley' and 'Thames-Clyde' became diesel-hauled throughout from the start of the 1961 summer timetable.
Most spotters have a love of the great outdoors and the solitude in the cutting was as close as I could get to nature.
In between the stately passage of trains (steam still carried considerable clout in those days) the peace and tranquility was a rural idyll that few railway photographers knew about and so I claimed it as my own.
(Above-Below) Labouring with a heavy rake of coal wagons, a Class 4F fills the air with smoke as it crosses the Aire river on the 'down' slow line.
Note the banner signals in the background and an early-liveried dmu forming the Bradford (Forster Square) Leeds City service making its obligatory stop.
The bulky 'Thames-Clyde' headboard did not sit easily on the top lamp iron of the 'Peak' class locomotives, as can be seen in this shot above of the train heading through Newlay Cutting.
Hidden under the grime of No D5224 (heading a Morecambe-Leeds train) is a two-tone green livery.
(Below) As steam eked out its final days in a poor state of disrepair, it became increasingly difficult for the operating department to find a suitable steam locomotive with a power classification relative to its train formation; either being too heavy or too light for the purpose.
(Below) In the opposite direction No 48084 trundles by with a rake of coal empties.
With hindsight I must have cut a rather reclusive, enigmatic figure to the indigenous wildlife in the cutting; I'd sit there for hours on end beneath the overhanging trees, spending most of the day shaded from the sunlight shimmering throughthe canopy of leaves.