FS Class 400 were

steam locomotive A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, Fuel oil, oil or, rarely, Wood fuel, wood) to heat ...

s of French construction, built for service in Italy. They were tender locomotives with two outside cylinders.

History

During the second half of 1860 the progress of the construction of the Porrettana railway highlighted the need to order locomotives suitable for the demanding Apennine route, so a construction order was issued for a group of 10 units to the prestigious Koechlin locomotive factory in

Mulhouse Mulhouse (; ; Alsatian language, Alsatian: ''Mìlhüsa'' ; , meaning "Mill (grinding), mill house") is a France, French city of the European Collectivity of Alsace (Haut-Rhin department, in the Grand Est region of France). It is near the Fran ...

. For a mountain route, the locomotives had a wheel arrangement for maximum adhesion. This was the first use of eight-coupled locomotives on Italian railways. The locomotives were delivered between 1861 and 1866 and entered service on the Porrettana railway. A second batch of 10 was ordered in 1871.

Ownership

# LVCI # Società anonima delle strade ferrate della Lombardia e dell'Italia Centrale #

Società per le strade ferrate dell'Alta Italia The Società per le strade ferrate dell'Alta Italia (''Upper Italian Railways'', ''SFAI'') was an Italian railway company from 1865 to 1885. History It was established on 1 July 1865 with of line it acquired from the state railway of the Kingd ...

(SFAI) #

Rete Mediterranea Rete Mediterranea (RM) defines that part of the Italian railway network that, under the law of 27 April 1885, no. 3048 was assigned to the Società per le Strade Ferrate del Mediterraneo for operation and development. These were mainly lines fro ...

(RM) #

Italian State Railways Ferrovie dello Stato Italiane S.p.A. (; ; previously only Ferrovie dello Stato, hence the initialism FS) is Italy's national state-owned railway holding company that manages transport, infrastructure, real estate services and other services in ...

(FS)

Numbering

Deliveries took place gradually, beginning in 1861. Owing to company changes, the early numbering is complex but, under the

(SFAI), they became 1281-1290. To cope with an increase in traffic, the company ordered a further batch of 10 locomotives, very similar but more powerful, from the Koechlin factory in 1871. These were assigned to the Frejus line and numbered 1291-1300. Later re-numberings and names are shown in the table below. Several locomotives were scrapped following accident damage but 14 units survived and passed to the

(FS) in 1905. The locomotives were of sturdy construction, characteristic of those designed by Edouard Beugniot, but were very rudimentary. After a few years' service with the FS they were relegated to

banking A bank is a financial institution that accepts Deposit account, deposits from the public and creates a demand deposit while simultaneously making loans. Lending activities can be directly performed by the bank or indirectly through capital m ...

heavy trains on the old Giovi line. They were withdrawn from service in 1909 and had been scrapped by 1910.

Features

The locomotives had a

0-8-0 Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of no leading wheels, eight powered and coupled driving wheels on four axles and no trailing wheels. Locomotives of this type are also referre ...

wheel arrangement. They were not mass-produced and there were some detail differences between units. There was a wide firebox located behind the

driving wheel On a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotive's pistons (or turbine, in the case of a steam turbine locomotive). On a conventional, non-articulated locomotive, the driving wheels are all coupled t ...

s and, to keep the

axle load The axle load of a wheeled vehicle is the total weight bearing on the roadway for all wheels connected to a given axle. Axle load is an important design consideration in the engineering of roadways and railways, as both are designed to tolerate a m ...

down to , a part of the weight was carried by the tender. The boiler supplied saturated steam at a maximum pressure of and the engine had two outside cylinders. The continuous power output of the first series of machines was . The locomotives were not equipped with pneumatic brakes but only a steam brake on the engine and a handbrake on the tender. The footplate was cramped and covered by a simple canopy. It was modified under RM ownership by closing it in to offer a better shelter for the crew. The tenders varied, some having two axles and others having three axles. In later years, the tenders were modified so that they no longer carried part of the locomotive weight. As was usual at that time, the locomotives were baptized and each received its own name. Seven units were involved in serious accidents and six were written off. The seventh was inherited by the FS in a wrecked condition.

First series

An obvious feature of the 10 locomotives of the first series was the three-axle tender, on which part of the locomotive weight was carried. The continuous power output was . The sandbox was placed adjacent to the steam dome and the supply pipe delivered sand ahead of the second axle. The safety valve was located on a small dome on top of the firebox.

Second series

The second series of 10 machines was modified by adopting a two-axle tender. The length of the firebox was increased to make it more capacious and the continuous power output rose to . The sandbox was moved near to the centre of the boiler and delivered sand ahead of the third axle. The safety valve was located on the steam dome, just behind the chimney.

Allocations

* Florence locomotive depot * Genova Rivarolo locomotive depot