fdhistorian said:
Battalion 40 originated as District 10 (originally District 1) of the Brooklyn Fire Department
It became Battalion 10 Brooklyn (because there already was a Battalion 10 in Manhattan) when BFD became part of FDNY.
It was renumbered as Battalion 30 when Brooklyn and Queens battalions were renumbered in 1898.
It was renumbered as Battalion 40 when Brooklyn, Queens and Staten Island battalions were renumbered in 1906.
Battalion 40 Organized 436 39th St 1906 with Engine 128
Battalion 40 Relocated 5011 7th Ave 1917 with Engine 278
Battalion 40 Temporary 5209 5th Ave 1975 with Ladder 114
Battalion 40 Relocated 5011 7th Ave 1975 with Engine 278
Battalion 40 Relocated 5209 5th Ave 2003 with Ladder 114
Battalion 40 Temporary 1336 60th St 2004 with Engine 247
Battalion 40 New Station 5113 4th Ave 2009 with Engine 201
Brooklyn District Engineer 1
1869 - 1882 District Engineer 1 E1 E2 L1
1882 - 1889 District Engineer 1 E1 E2 E20 L1
1889 - 1891 District Engineer 1 E1 E2 E20 E28 L1
1891 - 1892 District Engineer 1 E1 E2 E20 E28 L1 L9
Brooklyn District Engineer 10
1892 - 1896 District Engineer 10 E1 E20 E28 L9
1896 - 1898 District Engineer 10 E1 E20 E28 E41 L9 L14
Battalion 30 was first activated from 1898 to 1906 when it was renumbered as Battalion 40.
1898 - 1900 Battalion 30 E1 E20 E28 E41 L9 L14
1900 - 1905 Battalion 30 E101 E120 E128 E141c L59 L64
1905 - 1906 Battalion 30 E101 E120 E123 E128 E141c L59 L64
Companies in Battalion 40
1906 - 1913 Battalion 40 E101 E128 E141c L64
1913 - 1914 Battalion 40 E201 E228 E241c E278 E282 L114
1914 - 1941 Battalion 40 E201 E228 E241 E278 E282 L114 L148
1941 - 1951 Battalion 40 E201 E241 E278 E282 L109 L114 L148
1951 - 1969 Battalion 40 E201 E228 E247 E278 E282 L114 L148
1969 - 1975 Battalion 40 E201 E241 E278 E282 L109 L114 L148
1975 - 1979 Battalion 40 E201 E241 E278 E282 L109 L114 L148
1979 - 1989 Battalion 40 E201 E228 E241 E278 E282 L109 L114 L148
1989 - 2003 Battalion 40 E201 E228 E241 E278 L109 L114
2003 - Battalion 40 E201 E228 E241 E247 L109 L114
*c = combination engine and ladder