ANALYSIS OF THE POTENTIAL FOR REGIONAL AND TRANSPORT DEVELOPMENT OF THE BURGAS PORT AS PART OF THE DANUBE – BLACK SEA MULTI- PORT REGIONHUMAN RESOURCES PLANNING AT THE NATIONAL RAILWAY INFRASTRUCTURE COMPANY AND HOLDING BULGARIAN STATE RAILWAYS EAD. TECHNICAL ASSISTANCE AND TRAINING TO IMPROVE MANAGEMENORGANIZATION OF TAILOR-MADE TRAININGSORGANIZATION AND PROVISION OF TAILOR-MADE TRAINING OF EMPLOYEES OF THE ADMINISTRATION OF VITOSHA SOFIA MUNICIPALITYTRAINING AND PROFESSIONAL CONSULTATIONS ON THE IMPLEMENTATION OF BDS EN 50126-1: 2006, BDS EN 50159: 2010 STANDARDS, ESTABLISHED BY THE EUROPEAN COMMITTEE FOR ELECTROTECHNICAL STANDARDIZATION (CENELEC)RE-ENGINEERING THE RAILROAD MAINTENANCE, TRAFFIC CONTROL AND ENERGY DISTRIBUTION IN THE NATIONAL RAILWAY INFRASTRUCTURE COMPANYASSESSMENT OF THE MARKET DEMAND FOR RAIL TRANSPORT PASSENGER SERVICES IN THE REPUBLIC OF BULGARIA AND DEVELOPMENT OF SERVICE OPTIMIZATION MEASURESMEASURING OF THE DYNAMIC INTERACTION BETWEEN PANTOGRAPH AND CONTACT WIRE IN THE DIMITROVGRAD – SVILENGRAD SECTIONDEVELOPMENT OF A PRELIMINARY BUSINESS PLAN FOR NEW REGULAR RAILWAY SERVICE FOR TRANSPORT OF MULTIMODAL LOAD UNITS FROM PORT OF BURGAS (REPUBLIC OF BULGARIA) TO FREE ZONE PIROT (SERBIA)ELABORATION OF A CONCEPT FOR DEVELOPMENT OF THE BULGARIAN PORTS OF NATIONAL IMPORTANCE ON THE BASIS OF EXPECTED CARGO TRAFFIC VOLUMESFEASIBILITY STUDY FOR IMPLEMENTATION OF PROJECT “DEPLOYMENT OF ERTMS ALONG SOFIA – PERNIK – RADOMIR – KULATA RAILWAY LINE“DEVELOPMENT OF AN INTEGRATED TRANSPORT STRATEGY FOR THE PERIOD UNTIL 2030