Hello Accelerat. Sorry for the big delay, I was caught with university stuff. I do have some footage of Deda - Siculeni and Tusnad - Malnas but either are old or not sufficient. I hope this summer I'll ride the train often in those areas on daylight, since you can't see anything during night.
Some pictures from Tirgu Mures and around (yeah, diesel action) starting from April 2014
Loaded chemical train pulled by 60-0836-1
The same day, 81-0545-8 was the shunter busy for the day
Night view over Tirgu Mures Sud station
Daylight IR train 1645 from Bucuresti to Tirgu Mures. It is the perfect train to see the Malnas Bai - Deda especially during summer. The return one, 1646 Tirgu Mures - Bucuresti, is even better to do that !
Empty chemical train from Deda, pulled by 60-0125-9. This engine is 50 (!!!) years old and still active !
As usual here in Romania, a lot of discrimination is made. The good rolling stock is thrown on local trains where you find gypsies and other uneducated people who brutally pull the automatic doors instead of pushing a tiny little button. On express trains you may find the opposite, the rather unconfortable saloon cars or those badly modernised :
Unit 60-1195-1 in the head of a chemical tanker train. This is the heaviest train on Deda - Razboieni line, having almost 3000 tons ! A pusher is always needed for the train, but I haven't photographed it (it was 60-1045-8)
If you leave the city for like 5-7 km, you can find other ideal spots for trainspotting. This one was made near Vidrasau
Another heavy train with phosphate for our chemical fertilizer plant, pulled by 836 and pushed by "granny" 125 :

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Bucuresti - Tirgu Mures (bis)
Empty phosphate train pulled by 60-0684-5, shot from a bridge over the railway and Mures river
A local train from Tirgu Mures to Brasov
We also believe in colours !

The grain train was quite a surprise. We rarely see such action at the grain silo, about 1 train in every 2 years.
Night (or maybe early morning) shot of "3 in 1" local train (it goes in 2 directions but also carries an empty consist for a return train Deda - Tirgu Mures). Starting 2 weeks ago, the train is suspended on working days because of infrastructure works. It should continue running from tomorrow.
Some of you may like semaphores
New for this year is the introduction of season train Tirgu Mures - Deda - Brasov - Buzau - Mangalia. Moreover, it has a couchette car (an old 45-47 years old DB Autozug 05-70 Bcmh modernised into AcBcmee 40-31). I only managed to make a video, since the sun isn't helping me much in the evening.
https://www.youtube.com/watch?v=Wr_gL4Mkr8Y
An empty phosphate train from Brasov to Tirgu Mures Sud caught yesterday after my last exam. Most of my mates posted vacation pictures / messages on Facebook, but for me...I should act different
https://www.youtube.com/watch?v=hX2vD_H4mt0
I'll come back with some pictures of Hungarian pilgrim trains (it's a delicate matter) made 3 weeks ago.
I hope you enjoyed my report on our diesel trains.