The first documented history of the area was in 1147 and shows that, what is now known as Lehrte, was a relatively small farming village. Up to the year 1352, when the church, now known as Nikolauskirche, was built; the local farming residents attended Sunday church services in the village of Steinwedel.
At this time, Lehrte lay in the historical region known as theGroßen Freien which literally translates to thebig free and lay far from major transit and traffic routes.
Lehrte lay fairly dormant until 1843, when work began on theHanover–Brunswick railway, linking Lehrte with both towns. In the following year, work began on building lines toCelle (1845),Hildesheim (1846) andBerlin (1871).
When work on the railway line commenced, Lehrte had 755 inhabitants; 60 years later the population had increased approximately ten times. In 1898 the area of Lehrte was granted municipal rights and formally recognised as a town.
With the railway well and truly established, industry grew within Lehrte, including clay works, a mineral fertilizer works, a cement factory, canned goods and a sugar factory in 1883 which, until 2002, dominated the centre of the town. The cement factory was created in 1881 by Hermann Manske with other limited partners and was the second factory of the cement industry in the Hanover region.
In 1910 the cement factory was shut down. In 1911 a cattle market was established and Lehrte became one of the most important places for cattle trade and shipment in Northern Germany.[citation needed] In 1912, mining began on the potash reserves in the area. TheLehrter Bahnhof (Lehrte Station) inBerlin is named after Lehrte. It was opened in 1871 as the terminus of theline linkingBerlin with Lehrte andHannover, which later became Germany's most important east–west main line.[citation needed]
Since the 1920s, a large substation has existed inAhlten, which in 1944 was the end of the experimentalLehrte-Misburg HVDC line.