What the data for this category looks like
The policy and regulatory basis data for rail transit equipment mainly comes from public official documents issued by the National Railway Administration, the First Equipment Industry Department of the Ministry of Industry and Information Technology, and the China Rail Transit Equipment Industry Association. Data updates take effect immediately when new policies are released. Stock policies are sorted and archived on a quarterly basis. Each policy document includes six standard fields: policy document number, issuing authority, effective date, applicable equipment category (such as railway locomotives, urban rail vehicles, signal systems), core clauses, and official explanatory materials. Clause content consists of multi-paragraph long text. Units uniformly use the metric units and official document number format specified by the Standardization Administration of China.
What constraints these characteristics impose on multi-turn dialogue and prompt engineering
Fixed document numbers and structured fields of official policies require clear inquiry of the specific equipment category mentioned by the user during the first interaction. This avoids confusion across category policies. Long paragraph clause content can cause context window overflow. Set a limit on context truncation length for each single call. The real-time nature of policy updates requires regular synchronization of the latest policy library by the dialogue system. All responses must include the policy document number and effective date. Multi-turn dialogue must retain the messages array of conversation history. This passes the specific equipment model and policy document number query requirements mentioned by the user, avoiding repeated questions. The variables variable must bind exclusive classification rules for rail transit equipment. This filters irrelevant policy entries.
Configuration Settings
Reference only; verify against the target FastGPT release and deployment documentation.
| Configuration Item | Recommended Setting | Rationale |
|---|---|---|
| Maximum Context Length | 8000–12000 characters | Matches the average length of a single rail transit policy document. This avoids truncating core clauses |
| Question Optimization Switch | Enabled | Converts vague user inquiries about equipment categories into precise policy matching keywords |
| Single Recall Count | Top 3 entries | Clause content of single rail transit policy documents is lengthy. Too many recall results will cause context overload |
| Context Retention Duration | 3600 seconds | Adapts to the average conversation cycle of a single consultation for state-owned enterprise and public sector users |
| Data Source Synchronization Frequency | Every 7 days | Matches the regular update rhythm of rail transit policy releases. This balances timeliness and synchronization costs |
Three Common Misconfigurations
- Issue: The large language model returns empty content or the frontend displays blank pages. Cause: No context length limit is set. Long policy documents exceed the system window, preventing normal response generation.
- Issue: Sending a POST request to delete conversation records does not take effect. Cause: The
chatIdparameter is not passed correctly. This leads to failed session identification matching. - Issue: Responses do not mark policy document numbers or applicable equipment categories. Cause: The prompt words do not explicitly require referencing exclusive fields of rail transit policies. This leads to matching results that deviate from business requirements.
How to Verify Successful Configuration
- Initiate a multi-turn dialogue that includes a specific rail transit equipment category. Check if the system proactively asks for supplementary details to confirm the question optimization configuration is active.
- Upload a test policy document. Trigger a dialogue, then check that the context has been truncated to a reasonable length with no truncation or empty responses.
- Call the conversation export function. Check that the exported conversation content includes complete interaction records and policy reference information to confirm correct configuration.
- Manually modify the data source synchronization frequency. Check that the system automatically updates the policy library according to the set cycle to confirm the synchronization configuration is active.
The values provided are common starting points and should be measured against the reader's own samples.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-28.