You can go forward from Sinaia to Brasov (and from there to Bran).
Trains from Sinaia to Brasov (schedule at the time of this tip, otherwise check the website below):
IC 531-521 14:46-15:44
IC 346 16:03-17:02
IR 1527 17:08-18:11
IR 1623 18:37-19:40
IR 1643 19:40-20:46
IR 1764 20:17-21:25
IC 472 20:32-21:34
and 4 more trains from Sinaia to Brasov until midnight
Important: Don't take R trains, those are very slow, more stops, less nice inside
Reaching to Sinaia from Bucharest is easy. Just take the train from the train station (Gara de Nord).
Some morning trains (schedule valid at the time of this tip):
A1745 leaving 7:30 reaching 9:26 Sinaia
R831 leaving 8:30 reaching 10:26 Sinaia
A12621 leaving 9:42 reaching 11:42 Sinaia
To get back:
A1746 17:04 reaching 19:01 Bucharest
A12622 18:37 reaching 20:45 Bucharest
R526/532/540 20:46 reaching 22:41 Bucharest
Important: Don't use other trains than A,R or IC (express trains) .. DON'T take any P trains, those are very slow
Probably the best way to reach Sinaia is by train. They are pretty regular from Brasov, where most people would come from, passing through roughly every hour. There's only one line here through the mountain pass, though, so should one train get messed up, you are going to be waiting a very long time.
Train accidents are a regular occurrance in Romania these days, due to the old rolling stock, antiquated tracks and poor warning systems (especially at railroad crossings). A train crashed just before we got to the station, right before Sinaia. That train never arrived, and all four trains behind it got stacked up on the track.
We were stuck at the station for nearly five hours.
The station itself is a bit of a historical item. Complete with ancient, stinking, horrific, Turkish style toilets. I will probably have nightmares now just for thinking about them while writing this tip. You can even smell them while you wait to buy your ticket (or ask about why you have been waiting four hours already).
Apart from that it wasn't altogether unpleasant sitting in the station all that time. It's a beautiful location, and nobody gives you any hassle.
Unless you have a full day and you like walking up the hill, then a taxi is your best bet to sightsee around the various sights in Sinaia.
If you decide to walk it is a pleasant option while the area is very beautiful.
In fact the sights are close to each other to walk (Sinaia monastery, Peles and pelisor castle) but all of them are located well away from the train station
One of the most convenient ways to reach Sianaia from either Bucharest or Brasov is by train. As the city lies on the main railway between these two cities there are numerous trains that are running daily. Remember always to buy a ticket for either Rapid, IC or Accelerat trains as they meet better standards and are fast and accurate.
From Bucharest it is around 1:30 hour travel time.
Another option is to rent a car. I stronlgy advice you to find a good taxi driver (as we did) or arent a car. This helps a lot particularly as it saves time to move from one sight to the other as all of them are not located just outside the train station
Sinaia is easy to reach by train. It is situated on the popular rail line that links Bucuresti, Brasov, Sighisoara and Budapest. Nearly every train stops in Sinaia. The train station is a 10 minute walk from the palaces and a couple of minutes from the main street. It has a left luggage office and the staff was rather friendly. You also may be approached by people offering private rooms (camera)
The cable car up to 1400 metres (or beyond) is an interesting ride. It can be busy.
One cable car every half hour.