Ok, I've tested quite a few things and, to be perfectly honest, I think the current Expert level haulage goals ruin the map.
I tried a lot of things to get them consistently workable with the majority of seedings, and it really would require substantial revision of several aspects of the map. The problems are that A/ seedings vary wildly, with a high proportion being unusable, and B/ even when you get a workable seed the haulage goals are so tight that everything else about the map gets subordinated to them, right from the very start. A/ means you waste a lot of time. B/ means the map becomes highly restricted, very artificial, and generally less fun.
I'm sure everyone would like this to be a good map, and get there without driving everyone crazy (if that hasn't already happened) so I think we should get a bit more imaginative with Expert level goals. Then it can work reliably without rebuilding everything from scratch, and open the map up for more varied and enjoyable play.
Juriko, this is your map and ultimately it's your call how it goes. I don't want to turn it into something you're not happy with. However, I have already implemented a range of changes on a test map and it seems to play well. IMHO it's interesting and a lot more fun on Expert level, and should even be more interesting for non-experts.I've also fixed the rivers so they look better and flow in the right directions, and got rid of the old "ghost" river bed near Daugvapils.
For what it's worth my considered suggestions are as follows:
1/ I like the technical option to reduce oil and water consumption by 40%, instead of increasing train speed by 20%. It gives more effective locomotives (much greater range, and less time spent in servicing) without unrealistic speeds.
2/ Would suggest making the other option a 40% reduction on bridge costs, instead of 20%.
3/ Since Latvian locomotives in this period were not rockets, I would restrict the options to the S3, P8 and Class 500. I would also use two events, at the start of 1925 and 1926, to make the S3 and P8 available indefinitely. They are more in keeping with the period than the Class 500, and have some other advantages as well, but the Class 500 is a reasonable option for anyone who finds themselves needing a bit more speed.
4/ Get rid of corn farms. Corn isn't grown in Latvia anyway (wrong climate) and corn farms crowd out other industries. If necessary, use an event to increase production of wool and livestock (+25% should be about right).
5/ Increase the logging camps slider to 55%, to match the livestock slider.
6/ Sweden turns out to be useless. I'm not sure why, but no cargo ever goes to Sweden. Might as well remove it.
Haulage goals
7/ The seedings need to be changed a bit. If you want haulage to a given destination to be viable, it's no good having every possible industry seeding in every possible location. It just screws things up. With the low starting cash, tight haulage deadlines, and the long distances on this map, you need to make money. Lots of it. Fast.
Beginner players just lay rails and hope they can haul stuff. Expert players don't work like that. In general: you need industry, you need to own it, and you need it to work. This map doesn't allow that. There are so many meat packing plants and lumber mills and furniture factories popping up everywhere that anything you try to run is likely to get screwed at any time. The industry sliders for the towns need a bit of re-thinking so that the map does logical and sustainable things.
8/ If Riga is going to be the main port for haulage, the port recipe needs fixing. The Rubber to Alcohol conversion does not work because it is not profitable. The demand for meat in Riga is also too low for price stability with one port. It works much better if the conversion is Meat to Automobiles. That way the port will make money and Meat wont stack up until the price crashes.
9/ To work with 8/, disable the Tire Factory and Auto Plant. These items were imported in that period anyway.
10/ Reduce the Expert haulage requirements for Meat and Lumber. I think 160-200 is about right. This will allow more fun on the rest of the map.
11/ The warehouse recipes at Druja and Ostrov should be changed. If they demand logs or lumber or meat this will kill haulage to Riga.
12/ If Riga port is changed to convert Meat to Automobiles, include a goal to haul 10 Automobiles to Daugavpils. This would make a good Bronze medal goal. Connecting to Valmiera is too easy, even for beginners. Connecting to Daugavpils in 20 years is still easy and anyone should be able to get 30-40 loads of meat to Riga, which means they should be able to get 10-20 loads of Automobiles to Daugavpils.
13/ According to
this page "Latvia persisted through the Great Depression thanks to the strong background in agriculture. The country exported bacon, beet sugar,
milk products and
textiles to Western Europe. Latvian timber export formed 10% of the global market in the 1930’s." And according to
this other page "The butter industry was one of the most progressive and until 1932 one-third of all export."
RT3 doesn't have butter, but a cheese haulage goal could be used instead of butter. A haulage goal for clothing could substitute for textiles. Having more varied haulage goals should be more fun, instead of just having very large lumber and meat goals going to one place.
I suggest having territories at Liepaja and Ventspils, to take 20 loads of Cheese and 20 loads of Clothing as Silver medal goals. This would give people a good reason to use the western end of the map, instead of just laying track for the connections.
14/ I think adding a haulage goal to Pskov for Gold is a good idea. This will give people a reason to go there. Since it may be connected late in the game, I think 10 loads of Automobiles is about right. This should be easy to do quickly if you are running out of time.
Good feedback for juriko to consider. I agree that haulage goals tend to become uninteresting if that is the only thing to do. I would support increasing the revenue requirements for balance with this goal. 
They even out after a few years though.
