Felixstowe branch line
Motive power -- Diesel power
Table:
Class

Operator

Comments

15

British Rail

Lighter trains in the 1960s[35]

24

British Rail

Lighter trains in the 1960s[16]

31

British Rail

From 1959[15]

37

British Rail

From the 1960s[35]

47

British Rail

From the 1960s[35]

56

British Rail

During the 1990s[56]

57

Freightliner

58

British Rail

Occasional visitor in the 1990s[57]

66

Freightliner

66

GB Railfreight

66

DB Schenker

70

Freightliner

From 2010[58]

Looking at the given table and the supporting text listed.

Provide an answer to this question: what is the comment about the BTH Type 1 ? Provide just your answer in a JSON object {"answer": "YOUR ANSWER"}.

The British Rail Class 15 diesel locomotives , also known as the BTH Type 1 , were designed by British Thomson-Houston , and built by the Yorkshire Engine Company and the Clayton Equipment Company , between 1957 and 1961 . They were numbered D8200-D8243 .
British Railways ( BR ) , which from 1965 traded as British Rail , was the state-owned company that operated most of the overground rail transport in Great Britain between 1948 and 1997 . It was formed from the nationalisation of the Big Four British railway companies and lasted until the gradual privatisation of British Rail , in stages between 1994 and 1997 . Originally a trading brand of the Railway Executive of the British Transport Commission , it became an independent statutory corporation in 1962 designated as the British Railways Board . The period of nationalisation saw sweeping changes in the national railway network . A process of dieselisation and electrification took place , and by 1968 steam locomotion had been entirely replaced by diesel and electric traction , except for the Vale of Rheidol Railway ( a narrow-gauge tourist line ) . Passengers replaced freight as the main source of business , and one third of the network was closed by the Beeching Axe of the 1960s in an effort to reduce rail subsidies . On privatisation , responsibility for track , signalling and stations was transferred to Railtrack ( which was later brought under public control as Network Rail ) and that for trains to the train operating companies . The British Rail double arrow logo is formed of two interlocked arrows showing the direction of travel on a double track railway and was nicknamed the arrow of indecision . It is now employed as a generic symbol on street signs in Great Britain denoting railway stations , and as part of the Rail Delivery Group 's ( RDG ) jointly-managed National Rail brand is still printed on railway tickets .
The British Railways Class 24 diesel locomotives , also known as the Sulzer Type 2 , were built from 1958 to 1961 . One hundred and fifty-one were built at Derby , Crewe and Darlington , the first twenty of them as part of the British Railways 1955 Modernisation Plan . This class was used as the basis for the development of the class 25 locomotives . The final survivor , no . 24081 , was withdrawn from Crewe depot in 1980 .
The British Rail Class 31 diesel locomotives , also known as the Brush Type 2 and originally as Class 30 , were built by Brush Traction from 1957-62 . They were numbered in two series , D5500-D5699 and D5800-D5862 .
The British Rail Class 37 is a diesel-electric locomotive . Also known as the English Electric Type 3 , the Class was ordered as part of the British Rail modernisation plan . They were numbered in two series , D6600-D6608 and D6700-D6999 . The Class 37 became a familiar sight on many parts of the British Rail network , in particular forming the main motive power for InterCity services in East Anglia and within Scotland . They also performed well on secondary and inter-regional services for many years . The Class 37s are known to some railway enthusiasts as Tractors , a nickname due to the agricultural sound of the diesel engine of the locomotive . Despite all members of the class now being at least 54 years old , over 60 locomotives are still mainline registered and remain active undertaking a variety of passenger , freight and departmental duties on the national rail network in 2019 . Approximately 30 locomotives have been preserved .
The British Rail Class 47 is a class of British railway diesel-electric locomotive that was developed in the 1960s by Brush Traction . A total of 512 Class 47s were built at Crewe Works and Brush 's Falcon Works , Loughborough between 1962 and 1968 , which made them the most numerous class of British mainline diesel locomotive . They were fitted with the Sulzer 12LDA28C twin-bank twelve-cylinder unit producing 2,750 bhp ( 2,050 kW ) - though this was later derated to 2,580 bhp ( 1,920 kW ) to improve reliability - and have been used on both passenger and freight trains on Britain 's railways for over 55 years . Despite the introduction of more modern types of traction , a significant number are still in use , both on the mainline and on heritage railways . As of January 2020 , 78 locomotives still exist as Class 47s , with further examples having been converted to other classes ; 34 retain operational status on the mainline .
The British Rail Class 56 is a type of diesel locomotive designed for heavy freight work . It is a Type 5 locomotive , with a Ruston-Paxman power unit developing 3,250 bhp ( 2,423 kW ) , and has a Co-Co wheel arrangement . The fleet was introduced between 1976 and 1984 with a total of 135 examples manufactured . The first 30 locomotives ( 56 001 - 56 030 , factory classification LDE3500 ) were built by Electroputere in Romania , but these suffered from poor construction standards and many were withdrawn from service early for extensive rebuilding before re-entering revenue service . The remaining 105 locomotives were built by British Rail Engineering Limited ( BREL ) at Doncaster Works ( 56 031 to 56 115 ) and Crewe Works ( 56 116 to 56 135 ) . Enthusiasts nicknamed them Gridirons ( or Grids for short ) , due to the grid-like horn cover on the locomotive 's cab ends fitted to nos . 56 056 onwards .
The Class 57 diesel locomotives were re-manufactured from Class 47s by Brush Traction of Loughborough between 1998 and 2004 . The locomotives were fitted with re-conditioned EMD engines and the same model of traction alternator as that fitted to the Class 56 .
Freightliner Group is a rail freight and logistics company , formed in the United Kingdom in 1995 , and now having expanded into Australia , The Netherlands and Poland . Freightliner Limited is the largest intermodal freight transport operator in the United Kingdom and the second largest freight operating company in the country by revenue , behind DB Cargo UK . It is a subsidiary of Genesee & Wyoming .
The British Rail Class 58 is a class of Co-Co diesel locomotive designed for heavy freight . Introduced in 1983 , they followed American practice of modularisation . EWS withdrew them in 2002 after 19 years in service , and 32 were hired abroad - four to the Netherlands , eight to Spain and twenty to France .
The Class 66 is a type of six-axle diesel electric freight locomotive developed in part from the Class 59 , for use on the railways of the UK . Since its introduction the class has been successful and has been sold to British and other European railway companies . In Continental Europe it is marketed as the EMD Class 66 ( JT42CWR ) .
GB Railfreight is a rail freight company in the United Kingdom . It is owned by EQT Partners through its subsidiary holding company Hector Rail . Ownership is scheduled to pass to Infracapital in October 2019 .
DB Cargo UK , formerly DB Schenker Rail UK and English , Welsh & Scottish Railway ( EWS ) , is a British rail freight company headquartered in Doncaster , England . The company was founded in 1995 as North & South Railways , acquiring five of the six freight companies sold during the privatisation of British Rail , [ note 1 ] becoming the UK market leader in rail freight transportation . In November 2007 , EWS was sold to Deutsche Bahn , and in January 2009 rebranded as DB Schenker . In March 2016 it was rebranded as DB Cargo UK .
The Class 70 is a six-axle Co-Co mainline freight GE PowerHaul locomotive series manufactured by General Electric in Erie , Pennsylvania . The order placed in 2007 for 20 units , with an option for a further 10 , for Freightliner for operations in the United Kingdom was the first order for the PowerHaul type . General Electric 's product code for the class of loco is PH37ACmi .