The latest and last to be added are 700 pictures taken by John Laing photographers for the construction firm's in-house newsletter Team Spirit.
They show workers enjoying company away days at the seaside.
Historic England/John Laing Collection
The construction firm liked to reward its workers with trips to the seaside
John Laing was founded in Carlisle in 1848 and became one of Britain's biggest construction firms, playing a key role in rebuilding the nation after World War Two.
It arranged company away days, events and trips to the seaside for the families of its workers with photographs taken to record the occasions for the company's newsletter, published from 1946 until 2001.
Historic England/John Laing Collection
The company away days, such as this one from London to Bournemouth in 1953, were popular with the whole family
The photo collection, which has more than 230,000 images, is held by Historic England.
A spokesman said John Laing's management had "enlightened attitudes" towards its staff with a "strong focus on family values".
Historic England chief executive Duncan Wilson added: "Covering everything from seaside adventures to company sports days, these fantastic photographs evoke the joy of holidays and colleagues coming together."
Historic England/John Laing Collection
Many of the firm's workers went on its away days to seaside resorts
Historic England/John Laing Collection
Workers from South Yorkshire and the West Midlands were treated to a family trip to Skegness in 1954
Historic England/John Laing Collection
The Skegness fair was popular with all ages of those who went on the company trips
Historic England/John Laing Collection
An annual employees' sports day was also held with the 1966 event taking place at Copthall Stadium in the London suburb of Hendon
Historic England/John Laing Collection
Children were also encouraged to take part at the sports day
Historic England/John Laing Collection
The company's directors also joined in the frivolities, although the fun was often at their own expense
Historic England/John Laing Collection
The construction firm's workers were always keen to pass their skills to the next generation, as demonstrated by district manager GB Malcolm in Skegness in 1948
Historic England/John Laing Collection
Some popped to the Spa cafe in Bridlington for refreshments
Historic England
The away days were popular, as shown by the queue waiting at Bournemouth station
Historic England/John Laing Collection
The workers and their families found plenty to do on trips to resorts such as Gorleston-on-Sea near Great Yarmouth
Historic England/John Laing Collection
The firm would move its workers and their families en masse, in this case to Whitley Bay
Historic England/John Laing Collection
While some families enjoyed a meal in Whitley Bay...
Historic England/John Laing Collection
... others were happy with just a sweet treat in Minehead