The Seino Railway runs from Minoakasaka to Otomesaka just west of Ogaki. JR drops off empty wagons to Minoakasaka from Ogaki and then waits for the return full freight cars. This is a very scenic area and recommended to all. Just make sure you get there when you can get a JR service to and from Ogaki. This is only in the early mornings or late afternoons, as around lunch there are hardly any services!
And yes, I failed miserably to stick to the timetable I had previously wanted to follow. I'd slept in and therefore got to Minoakasaka around 1100 for the 1108 JR service. It was still definitely worth the wait. Below are a few of the good shots (including some of the Yoro railway.) Note that I walked from Ogaki to Minoakasaka and I do not recommend this, it's a considerable distance.
Note that once the JR engine has detached, the Seino diesel hooks and pulls away very quickly, they have no other traffic on their line and don't wait around!
I then proceeded to run back to Ogaki as I'd realised there was no JR passenger service at 1200 and there were also no visible taxis (I should've asked the station attendant!). On the way I dropped my camera battery, ruined my feet due to my sandles and missed the ~1300 Yoro Railway service. I then jumped on JR and got to Tomida to see the cement trains. If only I'd gotten up on time!!
Once in Tomida, I got to see one cement train leave and then two JR oilers pass... not as much as what the timetable would have indicated should have passed. There was a strange bogie-carrying-maintenance-car on the Kintetsu line though! I soon returned back to Osaka.