Actually nowadays Saregama don't have their masters and they have just arranged the stuff from here and there/cassettes/VCDs/ in whatever quality. One of my known told me that couple of decades back The Gramphone Company (earlier HMV, now Saregama) lost their all Masters because of fire in their Master Spools/Vinyl Store (Godown) however I haven't found any news about that so not sure if it is true but as we can see the quality of their ACDs may be it is.
Today they just use files from their server (not sure what the quality they have uploaded, seems they are already in mp3 format) to make ACDs or MP3.
You can visit HAMARACD.com (Saregama owns this website too) and compile your own collection from their database and get that compilation delivered to your address.
For better quality songs you can try EMI Audio CDs (Made in USA, England, UK etc) Probably they are better but I don't like some stuff on EMI too. But the 90's songs on EMI CDs are awesome and far superior than the Saregama/HMV ones.
The Train was on Polydor/Music India (later Polygram) now Universal.
Apna Desh, Paraya Dhan and
Anamika are on HMV
The Train, Paraya Dhan and Anamika should be good.
I wonder why Saregama have many songs in double echo like
1. Mere dil mein aaj kya hai (Daag) even the whole album was in double echo

2. Meri Bheegi Bheegi Si (Anamika)
3. Gham Ka Fasana (Manchali)
4. Ek Ajanabe Haseena se (Ajnabee)
(Saregama has this song but with dialogue which comes in mid of song) they have ripped this song from movie (seems pirated VCD) and in PATHETIC quality. But on Vinyl it is awesome and all the stanzas are continuously without any dialogue.
There are many examples like this.
etc
Better source available would be Vinyl for sure.