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Aim. To investigate prevalence and structure of cardiac arrhythmias in railway workers of working age. Material and methods. Holter monitoring of ECG (ECG HM) was performed in 136 males — train machinists and machinist assistants, aged 19-55 (mean age 37±2.9 years), without any cardiovascular complaints. ECG HM was performed with computer system “Labetex” (“Meditex”, Hungary). At standard ECG registration, arrhythmias (mostly extrasystoles) were observed in 17 participants only (12.5%). Results. Various cardiac arrhythmias were observed in 62 participants. Conductive abnormalities were identified in 6 individuals (10.6%): supraventricular pacemaker migration (n=4), and Stage I atrioventricular blockade (n=2). Episodic, low-grade ventricular and supraventricular extrasystolia (VES, SVES) was registered in 32 males (51.6%). Twenty-four individuals (37.8%) had high-grade VES, frequent SVES, in various combinations, as well as episodes on non-persistent V and SV tachycardia (VT, SVT). Conclusion. The observed high prevalence (45.6%) of cardiac arrhythmias in the working-age people without cardiovascular clinical symptoms reflects a need of more detailed examination in this population. ECG HM gives an opportunity to register cardiac arrhythmic episodes more often than standard ECG.