The curious case of Dadar "Junction"

My elders told me that a "junction" was always a station that was "big". While that satisfied my curiosity when I was small, I could see that the definition was not entirely correct as I grew up. Take for example, Mahim on the Western Railway. It is a junction, though it is small (compared to say Andheri, which is not a junction).

Some search on the subject revaled the following definition: A junction is a place where 2 or more "lines" meet (line is a set of tracks proceeding along a certain route). This is obvious if one considers the English meaning of the word "junction". Thus, Mahim is a junction since 2 different routes converge at Mahim; the Harbour line proceeding to King's Cirlce and the Western line proceeding to Matunga Road converge at Mahim. So, Mahim is a junction. Andheri is not a junction by the same definition.

What about Dadar? Technically, Dadar station has lines from Central and Western Railway. But, then the stations are physically different. Dadar Central Railway station is a physically separate entity from Dadar Western Railway station, even though their names are the same. Heck, even the station codes for the 2 stations are different (it is "DR" on the Central and "DDR" on the Western). That the 2 stations are connected by a bridge (actually 3 bridges - 2 railway and 1 for normal pedestrians) does not matter. Dadar is technically not a "junction". Now, confirm this fact by looking at the name of the station painted all over the platforms and you will see that Dadar is not a junction.

That's when the mystery starts: Travelling into Dadar from Parel (on the Central Railway), one can see an old dilapidated and abandoned building on the left hand side. This is just before entering the Dadar station. One can also see this, travelling on the Western Railway from Elphinstone Road to Dadar. This building is then on the right hand side. Painted on the walls of the building one can still clearly see the words "Dadar Junction South Cabin". What? Dadar, a junction?

Maybe it WAS a junction a few decades ago. Or was it a painting mistake? Most likely to be the former.